1) The end of the pedal threads (the side nearest the hub) got mangled
somehow, and when you loosen the pedal enough that they hit the crank
threads, it seizes up. Tighten the pedal back up and see if you can
clean up the end of the threads.
2) You cross-threaded the pedal when you originally installed it, and
the metal inside the crank is now all mangled. If so, you're probably
hosed. Hit the end of the wrench with a hammer until it moves, and see
if there's anything salvagable in your crank.
Some penetrating oil, like Liquid Wrench might help, but probably it's
just a question of brute force.
--
tholub
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kington99
Dave
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vizun
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If you aren't using a proper pedal wrench then get one.
Try rotating back and forth as suggested. It's not likely to be a
corrosion issue. Most likely, the threads in your crank are just a bit
munged up.
--
tmoyer
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hope it helps.
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SHAY_CAM
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